body {
    font-family: 'Arial', sans-serif;
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
    margin: 0;
    background: linear-gradient(135deg, #3498db, #8e44ad, #e74c3c, #f39c12);
    background-size: 400% 400%;
    animation: gradientAnimation 15s infinite;
}

@keyframes gradientAnimation {
    0% {
        background-position: 0% 50%;
    }
    50% {
        background-position: 100% 50%;
    }
    100% {
        background-position: 0% 50%;
    }
}

.converter {
    text-align: center;
    border: 1px solid #ccc;
    padding: 20px;
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.9);
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

.input-container {
    margin: 10px 0;
}

input, select, button {
    padding: 10px;
    margin: 5px;
    border: 1px solid #ddd;
    border-radius: 4px;
    box-sizing: border-box;
}

button {
    background: linear-gradient(45deg, #3498db, #8e44ad, #e74c3c, #f39c12);
    color: white;
    cursor: pointer;
    border: none;
    border-radius: 4px;
    padding: 10px 20px;
    font-size: 1em;
    transition: background 0.3s ease;
}

button:hover {
    background: linear-gradient(45deg, #f39c12, #e74c3c, #8e44ad, #3498db);
}
